Ritmo Mundo ' Quantum' Quartz Stainless Steel and Silicone Casual Watch, Color:Black (Model: 1201/7 Green) Swiss Ronda Case diameter: 50mm Chronograph watch, stainless steel, and aluminum case Durable mineral crystal protects watch from scratches Water resistant to 330 feet (100 M): suitable for snorkeling, as well as swimming, but not diving